Dry-battery cell.



G. N. EASTMAN.

DRY BATTERY CELL.

APPLICATION FILED AUG. 12,1903.

Patented Feb. 16, 1909.

witnesses,

tieuil'arly to a novel met -dry cells whereby a container is obtained fibrous material dip UNITED STATES.

PATENT onnrcn.

"GEORGE N. EASTM-AN, OF RIVERSIDE; CALIFORNIA.

DRY-BATTERY cnLL,

Specification of Letters Patent.

' Patented Feb.16, 1909 Application filed August 12, 1908. Serial No. 448,144.

which will be impervious to the electrolyte even in the event of the entire consumption of the cylindrical electrode'inca'sed in said container. It is a common fault in batteries of this type that the electrolytic fluidvery frequentlyvleaks and spreads over the outer surface of the battery, thereby shortcircuiting the same. Where a number of cells are connected in series the leaking of the electrolyte often short-circuits a art or all of the'cells. Aside from this, the oss of the electrolyte not only shortens the life of the cell but reduces its electromotive-force.

The container in this case is made of a ed in an impregnating compound of a se -adhering nature. The impregnated fiber not only adheres better to the sealingmaterial than metal does, and forms. a practically liquid roof seal, but it adheres to the cylindrical e ectrode and adeqglzltely protects it from corrosion while, at

same time, insulating it from adjacent cells'where connected in series. f

A further object of this invention is to avoid'the use of'solder in joining the ends of -the the cylindrical electrode, which eliminates ssibility of damage being caused by 'loc- I actioni'between the metals used in the solder and the metal of the electrode This difficulty 'I-may. overcome by employinginterleekmg flanges on the ends of said cylin-' driical electrode .as hereinafter described, or

. This common strips of the impregnated fibrous. material.

I which ma be cut oil to desired lengths.

by causing the ends of the cylinder to abut and be held: tlfisflposition by the container. 'culty may also be obviatedbyxinding zinc on a mandrel of a machine'in 'the form of a continuous spiral stri i and byhaving means for simultaneous y coveringthe zinc with spirally wound This forms a continuous tubular article In thefirst orm the "zinc is in sheets of less width the impregnated material and:

tainer.

the form where the container edge and the trode and container Wrapped in said material so as to provide an insulating space at either end, whereas in the spirally wound form the zinc and the.

impregnated fiber have their ends flush.

A metal cap is utilized for closing one end of the tube, which cap maybe held in place by placing therein a heated material similar to the im regnating*material of the con- T is material serves as insulation in zinc edge are flush. If desired, the cap may be formed of material similar to the 0011-.

tainer. The sealmay also be formed of the 'ini regnating material.

n the accom anying drawing and description' thereo I have shown the preferred forms of my invention, in which Figure 1 is an elevation of my im roved, form of cell showin the cylindrica eleci ormed of spiral strips, with parts broken away; Fig. 2 is an elevation of my battery, with parts broken away,

having the cylindrical electrode and its container formed of sheets of diiierent width; and Fig. 3 is a cross-sectional view showing the interlocking flanges used in the form illustrated in Fig. 2.

' Referring more in detail to the drawings in which similar characters of reference designate corresponding parts ;-A designates a tubular metal electrode which may be formed of a strip of sheet metal Wound spirally as'shown in Fig. 1. In'this construction the electrode A is incased in a fibrous material B impregnated with asphaltumor with a substance having similar ualities ofinsulation' and adhesion. In t 's form the fibrous material B is a strip and is spirally Wound upon the electrode,

In the process of construction it is intended.

to use a single machine for impregnating the fibrous material with the solution, winding the tubular electrode to the desired form and simultaneously winding the adhesive material on the metal electrode thereby forming a tube ofpermanent shape wine is practically continuous and which may be,

cut to the desired lengths. When the desired length of tube is obtained, it may-heclosed at oneend by-a cap C, which may be formed 'ofmetal or of the fibrous incasing material, or, in fact, of any material calculated to resist the action'of the electro lyte. If a metal is used it shouldbe par:

tially filled with the impregnating material,

as atiD, which not only insulatesgt from the electrode and removes it from contact with I 4. The method of making dry batte cups the electrolyte but which causes the. cap to adhere strongly to the tube. When the carbon electrode and the excitant filling are in place the other end maybe sealed with impregnating fluid, as at E, completely covering the metal electrode. It

will be readily seen that a homogeneous incasing structure is formed by the impregnating fluid which is impervious to the electrolyte and thereby prevents breakage.

In Fig. 2 is shown a modified form of my invention in which the electrode A is formed from a sheet of metal rolled to tubular form. The ends of this metal sheet may be joined together by interlocking anges as shown at Fin Fig. 3 or they may simply abut and be held in this relation by the incasing sheet'B. The sheet B in this form of the invention is preferably of a relative width to provide a space between either of its ends and the ends of the metal electrode A. The space at the bottom of the tube is filled with the impregnating material D in the cap The space at thetop is filled with the seal as in Fig- 1, showing the battery assembled in its complete form.

The employment of a metal cap C will be ap reciated by those familiar with electro ytic cells of this type, since it adds very materially to the strength and rigidity of the cell at the base portion where the cell is particularly liable to be. damaged. Moreover, in packing the cells for transportation and instoring them also, the rim or flange of the cap resists the pressure from the sides and relieves the fibrous casing.

It is clear that various modified constructions, other than those shown in the drawmgs, such as are consistent with the claims appended, may be used by me.

Having now described my invention, I claim 1.' The method of makin dry batteries which consists in winding a s eet metal elec ceptacles or cups, which consists in forming a ula r metal electrode, incasing said electrode n a li uid-proof self-adhering fibrous material, an closing one end with a liquidproof cap.

Witnesses:

which consists in constructing a meta electrode of tubular form and incasing said electrode in an adhesive fibrous material of sufficient rigidity to preserve the form of said electro e.

5. The method of forming dry battery cups which consists in spirally winding metal and fibrous strips in su erimposed relation to form a contlnuous tu e, cutting said tube to re%uired lengths, and capping one end of said tu e.

6. The method of forming dry battery cups which consists in spirally windillilgla metal electrode and fibrous strips sim taneously in superimposed relation toform a continuous tube, cutting; said tube "into required lengths, and capping one end of each tu e.

7. The method of formin dry battery cups which consists in spira y' windin a metal electrode and fibrous strips sim taneously in superimposed relation to form a continuous tube, cutting said. tube'into required lengths, and closing one end o r"each tube with a cap partially filled with an insulating material of an adhesive nature.

8.. The combination, in .a 'dry battery cuip, of a tubular electrode formed from spira y wound sheet metal, a casing for saidelectrode spirally wound upon and adhering to said e ectrode, and a cap im ervious to an electrolyte closing one end- 0 said tube.

9. The combination, in a dry battery cup, of a tubular electrode of s irally wound metal, a s irally wound a holding said electrode' to form, and a'closure for one end of the tube, said casing and said closure being impervious to an electrolyte.

10. The comb1nation,in a dry battery cup,

esive casing of a tubular electrode of metal, a self-adhering incasing material therefor, and a metal cap closing one end thereof, said incasing material and said cap being impervious to an electrolytic fluid. 11. The combination, in a battery cup, of a tubular electrode, .an impervious non-conducting incasing materia l, and a metal closure cap having an insulatmg)lm mg. 12. The com ination, in a attery cup, of a tubular electrode, an impervious incasmaterial; and a. closure cap partly filled with an-insulating material of an adhesive nature, said ca forminglghe bottom of the battery cup an surroun g the bottom o of the incasing material.

. In testimony whereof I aflix my slgnature in presence of two witnesses.

.GEORGE N. EASTMAN.

CLAaENoEAF-nr, JULIA R. Isnmion. 

